Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4ad683557ca2b6…

MALICIOUS

PDF

311.7 KB Created: 2021-06-26 08:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2f65ca5ba0284677f60a961ed1997abf SHA-1: cf20c23c6317c99c5e91b29565fbcd8137aa01d9 SHA-256: fe4ad683557ca2b698ba9c4d22bc8052d4849dd13dce09a1c068af382b468fd1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to external websites, including a redirector URL that appears to be part of a phishing campaign for free game downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution. No scripts were extracted, but the presence of numerous compromised CMS upload links suggests a broad phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=gta+5+100+mb+download+for+android PDF link annotation
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/557abb5a47065b6ccc3c982e3dbf995d/vafagorola.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/teraxijewino.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ded2adc24---21602412944.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e4f7f07acd417c3909a87acd72d7e6b6/rurisa.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/rupiwafusisatugumobuzur.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/53442412419.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/imf190k34312k610j9snb38vep/69689912404.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/xetinuzamusevos.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/xopiserijigijadedosun.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa19545c793---pirobapuwepaf.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68dfee5fd2---kofuwobuvebinexabika.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/mijamixis.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/31406286772.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4eb6bfa99ac88382487f051709283d8e/84914183898.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c0e59aec---66290466549.pdfIn PDF document text
    • http://www.puhito.hu/uploads/sinonapozigi.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/cac9465891d37748c13fce4026bebe5a/lukawurufo.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9a5d081e3f9a1ead69a739fc1b09e4fe/jojasosufebagafebemipu.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/16886359544.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/3141ec0d9063650c94e640e5f341274a/xedenake.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc5c817d14---34125686166.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/jevoxuwideguzegawegib.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/gepugowodusezuzumi.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/zitanuwazojawavewetud.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/monaxexutod.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/wisowemanowa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000454ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x454EC 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_01_sfnt_off00045d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00047515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47515 25504 bytes
SHA-256: 78e37e916d2b2ea8c2d199d124e3797352ff6b0da95278cb93ed7b50c9630c14
font_03_sfnt_off0004b4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B4E7 10788 bytes
SHA-256: d42383d6bf4b52bd3f8289f610b4b1912be9e1ab57914fc14633ebb166490f23